For those who have purchased hello tunes from Airtel will have to face a change, and that change is that before each hello tune the Airtel advertising will be heard when anyone makes a calls and airtel phone, but for those who have the hello tunes on their phone.
The advertising will be lasting for 7 seconds, in which case by that time someone picks up their call, so no use for the hello tune really is there! In other ways Airtel is also using their users money for which they brought their hello tune for advertising, and really not providing them with what they paid for.